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diff --git a/dom/webauthn/WebAuthnManagerBase.h b/dom/webauthn/WebAuthnManagerBase.h
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+++ b/dom/webauthn/WebAuthnManagerBase.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_WebAuthnManagerBase_h
+#define mozilla_dom_WebAuthnManagerBase_h
+
+#include "nsCycleCollectionParticipant.h"
+#include "nsCOMPtr.h"
+
+/*
+ * A base class used by WebAuthn and U2F implementations, providing shared
+ * functionality and requiring an interface used by the IPC child actors.
+ */
+
+class nsPIDOMWindowInner;
+
+namespace mozilla::dom {
+
+class WebAuthnTransactionChild;
+class WebAuthnMakeCredentialResult;
+class WebAuthnGetAssertionResult;
+
+class WebAuthnManagerBase : public nsISupports {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_CLASS(WebAuthnManagerBase)
+
+  explicit WebAuthnManagerBase(nsPIDOMWindowInner* aParent);
+
+  MOZ_CAN_RUN_SCRIPT
+  virtual void FinishMakeCredential(
+      const uint64_t& aTransactionId,
+      const WebAuthnMakeCredentialResult& aResult) = 0;
+
+  MOZ_CAN_RUN_SCRIPT
+  virtual void FinishGetAssertion(
+      const uint64_t& aTransactionId,
+      const WebAuthnGetAssertionResult& aResult) = 0;
+
+  MOZ_CAN_RUN_SCRIPT
+  virtual void RequestAborted(const uint64_t& aTransactionId,
+                              const nsresult& aError) = 0;
+
+  void ActorDestroyed();
+
+ protected:
+  MOZ_CAN_RUN_SCRIPT virtual ~WebAuthnManagerBase();
+
+  bool MaybeCreateBackgroundActor();
+
+  // The parent window.
+  nsCOMPtr<nsPIDOMWindowInner> mParent;
+
+  // IPC Channel to the parent process.
+  RefPtr<WebAuthnTransactionChild> mChild;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_WebAuthnManagerBase_h